Improvement in alarm-clocks



2 Sheets-Sheet 1. S. JOHNSON.

ALARM CLOCK. N0.180,594. Patented A-ug.1,1876.

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UNITED STATES PATENT Orrroa SANDER JOHNSON, OF MINNEAPOLIS, MINNESOTA,ASSIGNOR OF ON E-HALF HIS RIGHT TO JOHN N. BERG, OF SAME PLACE.

IMPROVEMENT IN ALARM-CLOCKS.

Specification forming part of Letters Patent No. 180,594, dated August1, 1876; application filed May 31, 1876.

To all whom it may concern:

Be it known that I, SANDER JoHNsoN, of Minneapolis, Minnesota, haveinvented certain new and useful Improvements in Alarm- Olocks, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, making a part of this specification,in which Figure 1 is a front elevation with a portion of the face brokenaway. Fig. 2 is a vertical cross-section through the line 0000. Fig. 3is a section through the line 2 z of Fig. 2, showing the time mechanismin gear. Fig. 4c is a section through 3 y of Fig. 2, showing alarmmechanism in gear.

My invention relates to that class of alarmclocks used by cooks; and itconsists in the devices by which the time mechanism and alarm mechanismare alternately and automatically thrown in and out of gear.

To enable others skilled in the art to make and use my invention, I willproceed to describe the exact manner in which I have carried it out.

In the drawings, A represents the index or hand, provided with the knobto, by which the hand is held when being moved for the purpose ofsetting the clock, or for the purpose of winding up the mainspring. Thishand is attached at the outer end of short shaft B, on which is themainspring Z) and the main driving-wheel O. Rigidly attached to theinner side of the driving-wheel O is the cam D, as shown in Fig. 3. Onthe outer end of the shaft E is rigidly attached the pinion 6, gearingwith the driving-wheel O, and on the center of same shaft is arrangedthe cog-wheel F,

which gears into and drives the time mechanism. This mechanism isarranged within the independent frame G, pivoted at g, the frame beingheld in position by the spring H, and the pinion m being thus held ingear with the cog-wheel F, which operates the time mechanism. On therear of the frame G is loosely pivoted the alarm-escapement h, on theupper arm of which is the hammer for striking the alarm upon the gong J.N ear the rear end of the shaft E, and behind the cog-wheel F, isrigidly secured the toothed wheel I, as shown in Fig. 4, so arranged onthe shaft that it will be brought in contact with the escapement h whenthe frame G is thrown forward. In the forward portion of the frame G isa pin, K, against which the cam D comes in contact as it moves in thedirection of the arrow, whereby the frame is forced forward, as shown indotted lines in Fig. 3.

It is evident that by thus throwing forward the frame G at anypredetermined time, the pinion on will be ungeared from the cog-wheel F,and operations of the time mechanism will be suspended, while the alarmescapement will be drawn into gear with the cog-wheel F, and the alarmwill be immediately given.

To wind up the spring again, it is only necessary to take hold of theknob a, and turn to the left until the pin K again passes over the camD, when the frame G is drawn back by the spring H into its firstposition, and the time mechanism is again in gear, and the alarmmechanism is again out of gear. As soon as the pin K drops over the camD, and the time mechanism is in gear, it is only necessary to turn theindex A to the left, and set it at any desired point. For instance, ifthe cook wishes to have her attention called in five minutes, she turnsthe index to the figure 5, and at the expiration of five minutes theautomatically -changed gearing causes the alarm to be given.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In an alarm-clock, the pivoted frame G, holding the time mechanismand the alarmescapement, and provided with the pin K, in combinationwith the cam D and gear mechanism, substantially as and for the purposeset forth.

2. In an alarm-clock, time mechanism, and alarm mechanism, which arealternately and automatically thrown in and out of gear with.

one another, substantially as and for the purpose set forth.

In testimony that I claim have hereunto set my hand.

SANDER JOHNSON.

the foregoing I Vitnesses:

JOHN N. BERG, VERNON BELL.

